Ground state energy of spin-1/2 fermions in the unitary limit

Details Ground state energy of spin-1/2 fermions in the unitary limit Ground state energy of spin-1/2 fermions in the unitary limit

2005-11-14

arxiv.org/abs/cond-mat/0511332v2

Phys.Rev. B73 (2006) 115112

Physics

Condensed Matter

Statistical Mechanics

17 pages, 9 figures, expanded manuscript includes more data and cross-checks

Scientific paper

10.1103/PhysRevB.73.115112

We present lattice results for the ground state energy of a spin-1/2 fermion system in the unitary limit, where the effective range of the interaction is zero and the scattering length is infinite. We compute the ground state energy for a system of 6, 10, 14, 18, and 22 particles, with equal numbers of up and down spins in a periodic cube. We estimate that in the limit of large number of particles, the ground state energy is 0.25(3) times the ground state energy of the free Fermi system.

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